Ignition timing control means for internal combustion engines



NOV. 10, 1942. MALLQRY Y 2,301,554

IGNITION TIMING CONTROL MEANS FOR INTERNAL COMBUSTION ENGINES Filed Jan. 2, 1942 INVENTOR. MARION MALLORY Sand causes the spark to be advanced still further.

If a governor is not used to control the speed of the engine, the spark will be advanced by the suction created at orifice 5 when the throttle is wide open, and, when the engine speed is checked by closing throttle I2, providing the throttle valve l2 does not close to idle position, the spark will be advanced by the vacuum existing between throttle l2 andthe engine.

I claim:

1. In an internal combustion engine the combination of a carburetor including an intake passageway, a throttle valve in said passageway, a governor controlled throttling means in said passageway on the engine side of said throttle'valve, a conduit having one end terminating in the intake passageway on the atmosphere side of the throttle valve, a second conduit communicating with the first conduit and communicating with the intake passageway on the engine side of said governor controlled throttling means; and valve means controlling the second conduit whereby the second conduit is placed in communication with the intake passageway on the engine side of the governor controlled throttle means at part and full open throttle and shut oif from the intake passageway at idle position of the throttle, and a suction controlled ignition timing device connected to the first mentioned conduit for advancing and retarding the timing of the ignition asthe throttle or charge is varied.

2. The combination as claimed in claim 1 wherein the throttle valve is mounted upon a shaft and aconnection is provided between the shaft and the valve means whereby the valve means is closed when the throttle is at idling position and is open at all other positionsoi the throttle valve.

3'. The combination as claimed in claim 1' wherein the valve means comprises a shaft for the throttle valve having a portion extendingacross the second conduit for closing the same when the throttle valve is at idle position, said shaft having a cut away portion which serves to open the second conduit at all open positions of the throttle valve.

4. In an internal cornbustion engine 1e combination of an ignition'timer and a carburetor having an intake passageway and two orifices located in said passageway, a manually controlled throttle valve in the'intake passageway, a governor controlled throttle valve in the intake passageway on the engine side of the manually controlled throttle valve, one of said orifices being positioned on the atmosphere side of the manually controlled throttle valve and-the other orifice being positioned on the engine side of the governor controlled throttle valve,-a conduit connecting the two orifices together, valve means in said conduit for shutting ofi the second mentioned orifice from the-first mentioned orifice when the manually controlled throttle valve is in idle position, and a single suction device which controls the ignition timer connected to said conduit between the first mentioned orifice and the said valve means whereby the ignition timing is advanced or retarded as the charge or throttle is varied.

5. In an internal combustion engine the combination of an ignition timer and a carburetor having an intake passageway including a venturi and two orifices located in said passageway, a manually controlled throttle valve in the intake passageway, a governor controlled throttle valve in the intake passageway on the engine side of the manually controlled throttle valve, one of said orifices being positioned in the venturi and the other orifice being positioned on the engine side of the governor controlled throttle valve, a conduit connecting the two orifices together, valve means in said conduit for shutting off the second mentioned orifice from the first mentioned orifice when the manually controlled throttle valve is in idle position, and a single suction device which controls the ignition timer connected to said conduit between the first mentioned orifice and the said valve means whereby the ignition timing is advanced or retarded as the charge or throttle is varied 6. In an internal combustion engine having a manifold a carburetor having a manually operatedthrottle valve to vary the charge admitted to the manifold, a governor controlled throttle valve on the engine side of the manually operated throttle valve, a conduit having'branches,

the first branch communicating with the mani-.

fold on theengine sideof the governor controlled valve, the second branch communicating with the carburetor throat, a suction controlled ignition timing device communicating with a third branch of the conduit, said second and third branches of the conduit being in continuous communication, and valve means in said first branch for controlling thev first branch whereby the first branch is placed in communication with the manifold on the engine side of the governor controlled valve when the manually operated throttle is open and shutoff from the intake passageway at idle position of the manual throttle,

whereby the ignition timing is advanced or retarded as the charge or throttle is varied.

'7. The combination as claimed in claim 6 wherein the valve means comprises a shaft upon which the manually operated throttle valve is mounted, said shaft extending across the first branch for closing the same when the manually operated throttle is at idle position, the said shaft having a cut away portion which communicates with the first branch to open the same when the throttle is at part and full open positions.

8. In an internal combustion engine having a manifold, a carburetor including a venturi and having a manually operated throttle valve to vary the charge admitted to the manifold, a governor, controlled throttle valve'on the engine side of the manually operated throttle valve, a conduit having branches, the first branch communicating with the manifold on the engine side of the governor controlled valve, the second branch communicating with the venturi, a suction controlled ignition timing device communicating with.

a third branch of the conduit, said second and third branches of the conduit being in continuous communication, and valve means in said first branch for controlling the first branch, and a connection between the valve means and the manually operated throttlevalve whereby the first branch is placed in communication with the manifold on the engine side of the governor controlled valve when the manually operated throttle is open and shut off from the intakepassageway at idle position of the manual throttle whereby the ignition timing is advanced or retarded as the charge or throttle is varied.

9. In an internal combustion engine the combination of an ignition timer and a carburetor having an intake passageway including aventuri, a throttle valve in said passageway on the engine side'of the venturi, a conduit having one,

end terminating in the venturi, a second conduit communicating with the first conduit and communicating with the intake passageway on the engine side of said throttle valve, valve means controlling the second conduit whereby the second conduit is placed in communication with the intake passageway on the engine side of the throttle valve at all open positions of the throttle and shut off from the intake passageway at idle position of the throttle, and a suction device which controls the ignition timer connected to the other end of said first mentioned conduit whereby the ignition timing is advanced or retarded as the charge or throttle is varied.

MARION MALLORY. 

